Valve refinishing tool



March 1952 J. v. BUECKERMANN 2,588,353

VALVE REFINISHING TOOL Filed Nov. 15, 1948 2 SHEETS-SHEET l INVENTOR. John V. Bueckermonn ATTORNEY March 11, 1952 J. v BUECKERMANN 2,588,353

' VALVE REFINISHING TOOL- Filed NOV. 15, 1948 2 SHEETS--SIIEE:T 2

140 M I38 n, /36 l 134 L32 m wk INVENTOR.

John V. Bueckermun FlGr'lO ATTORNEY Patented Mar. 11, 1952 UNITED STATES PATENT OFFICE;

VALVE REFINISHING TOOL John V. Bueckermann, Denver, 0010.

Application November 15, 1948, Serial No. 60,100

7 Claims. 1

This invention relates to a device for refinishing valves and valve seats, and is particularly adapted to refinish the exhaust and intake valves in internal combustion engines and their respective seats.

One object of the present invention is to provide an improved device of the general type shown in my prior Patent No. 1,824,327, patented September 22, 1931, for refinishing the valve and seat while the valve is in position.

Another object of the present invention is to provide an improved device which will simultaneously refinish both the valve and the valve seat with convex seating surfaces thus providing substantially line contact.

Further objects of the invention are to provide improved means for holding a flexible abrasive material on both the inner and outer conical surfaces of a refinishing head, and an improved surface for supporting the flexible abrasive material and increasing the cutting action thereof.

A still further object of the invention is the provision of an extended guide sleeve which can be used to determine whether or not the valve stem is bent and can also be used to replace a :1

worn valve guide during the refinishing operation to provide positive alignment of the valve head and valve seat with the refinishing head.

Further objects of the invention will be apparent from the following description and draw- 5.

ings in which:

Fig. 1 is a vertical section through a portion of an internal combustion engine showing the present invention in operative relation to a valve and valve seat;

Fig. 2 is a view similar to Fig. 1 showing a modified form of the invention in partial section;

I Fig. 3 is a partial section of the refinishing de vice shown in Fig. 2 taken at 90 from the View in Fig. 2;

' Fig. 4 is a top plan view of the refinishing head;

Fig. 5 is a top plan view of the solid adapter sleeve;

Fig. 6 is a side elevational view of the adapter shown in Fig. 5;

Fig. 7 is a side elevational view of the clamping collar or nut;

Fig. 8 is a top plan view of the clamping ring shown in Fig. 7;

Fig. 9 is a sectional view similar to Fig. 1 showing a modified form having a split adapter sleeve for use with a valve having a mushroom type follower;

Fig. 10 is an exploded view of a split adapter bushing also shown in Fig. 9; and

Fig. 11 is a partial section of a modified form of refinishing head with diamond shaped projections on the conical surfaces thereof.

Referringto the drawings in detail, the nufunction.

Refinishing device The refinishing device l8 comprises a refinishing head 22, also shown in Fig. 8, having a cylindrical upper portion 24 with a hole 26 extending therethrough. A short cylindrical pin 21 extends through hole and engages rotary clamping head for a purpose to be described subsequently. A frusto-conical portion 30 extends downwardly from the cylindrical portion 24 and has slots 32 and 34 at opposite sides positioned in 90 relation to the hole 26.

The frusto-conical portion 30 provides an up per frusto-conical surface 36 which supports a frusto-oonical shaped piece of flexible, abrasive material 38 having its free ends held in a clamp 40 made of metal or any other suitable material. Frusto-conical portion 30 also provides a lower frusto-conical surface 42 which supports another frusto-conical shaped piece of flexible, abrasive material A l having its free ends held in a clamp 48. Clamps li) and 4B are inserted in slots 32 and 34 respectively and prevent rotation of the two pieces of flexible abrasive material 38 and 44.

The two pieces of flexible abrasive material 38 and 44 are further held in fixed position by the guide sleeve 48 shown also in Figs. 4 and 5, and clamping collar or nut 50 shown also in Figs. 6 and 7. Guide sleeve 48 has a frustoconical flange 52, which engages the lower edge of the flexible abrasive material 38, an enlarged cylindrical opening 54, a reduced cylindrical guide portion 56 slidably engaging valve stem 58 of valve I6. Guide sleeve 28 has external. threads 60 engaging internal threads 62 on clamping collar 50. Collar 59 also has an upwardly extending frusto-conical flange 63 which engages the lower edge of the flexible abrasive material 44. The lower cylindrical portion 64 of clamping collar 5?] has flats S5 and 68 provided on opposite sides to engage a wrench or other suitable means (not shown) for tightening and loosening the collar.

Extended elongated guide sleeve As shown in Figs. 2 and 3 the guide sleeve 48 may be extended downwardly to form an elongated guide sleeve 48a which performs: a dual First the valve stem 58 is inserted in the close fitting guide sleeve to determine Whether or not the valve stem is straight. If the valve stem will not pass through the guide sleeve 48a it is obviously bent and the valve must be thrown away and a new valve used.

Secondly, if the valve guide 12a (i. e. a valve guide I2a of a replaceable type such as shown in Fig. 9) is worn, it may be removed and the elongated guide sleeve 48a inserted in the valve guide rest 13 as shown in Fig. 2. The elongated guide sleeve 48a will thus obviously provide a much better alignment of the valve seat, valve head and refinishing head than the short sleeve 48 would with a worn valve guide.

Fig. 2 also illustrates the use of the device without the clamping head where the valve head has a suitable slot'or depressions for direct engagement with the pointed ends N2 and i34 of forked member 136. A slightly longer cylindricallpin 21a is used here and extends between the'legs'of forked member I35 to cause the valve I 6 and refinishing device E8 to rotate together during a certain portion of the refinishing operation to be described subsequently.

Split adapter In Figs. 9 and 10 another modification of the guide sleeve 48 is shown wherein the sleeve is made up of three component parts 587), 48c and 48d. The outer bushing 68b is similar to guide sleeve 48 except for the provision of a uniform cylindrical internal surface which closely engages the outer semi-cylindrical walls of the split adapter bushing comprising the two parts 480 and 48d'more clearly shown in Fig, 10. The two parts of the adapter bushing each have frusto-conical upper portions 520 and 52d corresponding to the frusto-conical upper portion 52b of part 48b, enlarged stepped portions 540 and 54d, and reduced semi-cylindrical guideportions 56c and 56d which slidably engage the valve stem 58. The split adapter bushing permits insertion of a valve having an enlarged or mushroom type follower at one end as shown in Fig. 9. A removable and replaceable two part valve guide I20, pivoted at H is shown in Figs. 9 and 10 seated in a valve guide rest It. This is conventional structure on engines using a valve having an enlarged follower at one end.

Diamond surface on refinishing head Operation In the operation of the device as shown in Fig. 1 the refinishing head'is p'rovided with'a course, abrasive material 38 and A, particularly if the valve and seat are badly pitted, and is set in the valve seat as shown. The valve stem 58 is then inserted through guide sleeve 38 and valve guide [2.

By rotating shaft M3 the valve it isrot'ated in the refinishing device 3 to refinish the valve seating surface I22 on abrasive material 38 to the proper angle. If necessary, the pin 21 may be partially inserted in hole 26 and the outwardly extending portion abutted against any convenient projection on the block to prevent rotation of the refinishing head 22.

For refinishing the valve seat [4 the pin 21 is fully inserted to engage block H3 or 12 and prevent relative rotation between valve !6 and the refinishing device 18. Rotation of shaft I40 will now cause both valve I5 and refinishing head 22 to rotate simultaneously and the abrasive matrial 44 will refinish valve seat It to the proper angle.

By the use of a flexible, abrasive material having more frictional drag in one direction of rotation and choosing discs 33 and 4d having the greatest drag in opposite directions of rotation the use of pin 2'! may be eliminated. It is found that when the discs are so chosen and the shaft E i-.3 is rotated in one direction, for instance clockwise, the refinishing head 22 will remain stationary in the valve seat l4 and the valve 3 will move relative thereto. is rotated in the opposite direction, in this instance counterclockwise, the valve l i will not rotate relative to the refinishing head 22 butthe latter will rotate in the valve seat I4.

The operation is repeated with successively finer abrasive material until the mating surfaces are of the desired smoothness. Due to the flexibility of the abrasive material 33 and M, and a slight wrapping effect thereof the mating surfaces will be slightly convex and thus provide an improved straight line contact between the valve E6 and valve seat M.

The use of the device shown in Figs. 2 and 3 is similar to that described above except for the removal of thereplaceable valve guide prior to insertion of the refinishing device :8, and the use of the extended elongated guide sleeve to test the valve it for a bent valve stem 58 as explained previously. Here also it is assumed that the valve head I'M! has a suitable slot or depressions (not shown) for engagement directly by forked member i3, but it is to be understood that. this modified refinishing head can also be used with the rotary clamping head 20 for use, with vfiat topped valve heads. V

The use of the device shown in Fig. 9 is similar *to that described with reference to Fig. 1 except for the removal of valve guide l2a before removing valve lGa, inserting the valve stem 58a through the outer bushing 48b, slipping the two parts 480 and 48d of the adapter bushing into position, and then replacing the valve guide. The two parts 480 and Add of the split adapter bushing may alsobe extended to engage the valve guide rest it to'elirninate the necessity of using valve guide I2a during refinishing and thus provide better alignment of the valve refi nishing device and valve seat particularly if the valve guide is worn. o

The refinishing head 22a may be used in place of refinishing head 22 in any of the devices shown and will obviously function in the same manner except for the faster cutting action which will reduce the timerequired for a complete refinishing'op'erationp ff a I s It will be obvious that the angle of frustoconical'portiontll and surface sfifi and {i2 may be varied to correspond to the: particular angle of the ,valve and valve seat being refinished; j Thestructureshownand described is for the When the shaft Mil purpose of illustrating the invention and it is obvious that it may be modified in many respects without departing fromthe scope of the present invention as set out in the following claims.

What I claim and desire to secure by United States Letters Patent is:

l. A refinishing device for valves and valve seats comprising a head having an inner frustoconical surface and an outer frusto-conical surface, and a slot extending through said frustoconical surfaces, a frusto-conical abrasive element on each of said surfaces, a guide sleeve extending through said head and having a frusto-conical flange at one end engaging the abrasive element on said inner surface, said sleeve also having a cylindrical inner surface adapted to guide a valve stem and external threads, and a collar having a frusto-conical flange engaging the abrasive element on said outer surface and internal threads engaging said external threads to hold said surfaces in true conic positions while preventing movement of said abrasive elements, and said sleeve having an elongated cylindrical extension adapted to engage a valve guide rest externally and to provide an extension of said cylindrical inner surface.

2. A refinishing device for valves and valve seats comprising a head having inner and outer surfaces, abrasive elements on said inner and outer surfaces adapted to engage said valves and valve seats respectively, a bushing extending through said head and having means engaging the abrasive element on said inner surface, a split adapter mounted in said bushing, and a collar removably secured to said bushing and having means engaging the abrasive element on said outer surface.

3. A refinishing device for valves and valve seats comprising a head having an inner frustoconical surface and an outer frusto-conical surface, a frusto-conical abrasive element on each of said surfaces, a bushing extending through said head and having a frusto-conical flange at one end engaging the abrasive on said inner surface, a split adapter mounted in said bushing, said adapter having a substantially cylindrical inner surface adapted to guide a valve stem, and a collar removably secured to said bushing and having a frusto-conical flange engaging the abrasive element on said outer surface.

4. A refinishing device for valves and valve seats comprising a refinishing head having a frusto-conical body portion of uniform wall thickness, a cylindrical body portion extending upwardly from the larger diameter end of said frusto-conical body portion having a hole extending transversely through one wall thereof and a slot extending diametrically therethrough, two strips of flexible abrasive material having their opposite ends secured in clamps to form frusto-conical abrasive elements, one of said abrasive elements resting on the upper surface of said frusto-conical body portion with the clamp inserted in one part of said slot, the other of said abrasive elements resting on the lower surface of said frusto-conical body portion with the clamp inserted in the other part of said slot, a guide sleeve extending through the smaller diameter end of said frusto-conical body portion, and means on said guide sleeve for simultaneously clamping both of said abrasive elements to said frusto-conical body portion, adjacent the smaller diameter end thereof.

5. A refinishing device for valves and valve seats comprising a refinishing head having a frusto-conical body portion of uniform wall thickness, a cylindrical body portion extending upwardly from the larger diameter end of said frusto-conical body portion having a hole extending transversely through one Wall thereof and a slot extending diametrically therethrough, two strips of flexible abrasive material having their opposite ends secured in clamps to form frusto-conical abrasive elements, one of said abrasive elements resting on the upper surface of said frusto-conical body portion with the clamp inserted in one part of said slot, the other of said abrasive elements resting on the lower surface of said frusto-conical body portion with the clamp inserted in the other part of said slot, a guide sleeve extending through the smaller diameter end of said frusto-conical body portion, and means on said guide sleeve for simultaneously clamping both of said abrasive elements to said frusto-conical body portion adjacent the smaller diameter end thereof, and said frusto-conical body portion having diamond shaped projections on the operative faces thereof formed by crossing diagonal grooves.

6. A refinishing device for valves and valve seats comprising a head having an inner frustoconical surface and an outer frusto-conical surface, and a slot extending through said frustoconical surfaces, an abrasive element on each of said frusto-conical surfaces and engaged in said slot, a guide sleeve extending through said head and having means engaging the abrasive element on said inner surface, and a collar for threaded engagement with said guide sleeve having means engaging the abrasive element on said outer surface for holding said surfaces in true conic positions while preventing movement of said abrasive element.

7. A refinishing device for valves and valve seats comprising a head having an inner frustoconical surface and an outer frusto-conical surface, and a slot extending through said frustoconical surfaces, an abrasive element on each of said surfaces and engaged in said slot, a guide sleeve extending through said head and having a frusto-conical flange at one end engaging the abrasive element on said inner surface, said sleeve also having a cylindrical inner surface adapted to guide a valve stem and external threads, and a collar having a frusto-conical flange for engaging the abrasive element on said outer surface and internal threads for engaging the external threads on said sleeve to hold said surfaces in true conic positions while preventing movement of said abrasive elements.

JOHN V. BUECKERMANN.

REFERENCES CITED The following references are of record in the file of this patent:

Dougherty Dec. 9, 1941 

